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I have a three story detached house which uses a lot of energy, particularly in the winter. I'm looking to insulate the loft but I'm not sure which kind of insulation to go with. Glass wool seems like option, but a friend says she has some rigid foam insulation going spare, which is probably enough to cover my attic. What would be the best option to go with, or should I use another sort of insulation material?

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    Where are you located (region, height) and what is the climate over the year (temperature, humidity) - edit your question.
    – user2451
    Commented May 26, 2016 at 7:32

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Blown or batts. See HomeDepot for a comparison. Look at R-Value and height and depth. Also, both fiberglass and cellulose can iritate your lungs. So wear a respirator. Also check out the HomeDepot recommended R value for your zone. I would suggest cellulose. BTW, I DO NOT suggest buying from Home Depot or any other big box. Keep your purchases local if you can.

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    Can you please edit your answer to address the question - which is best and why. Just giving a couple of examples with links to a shopping site doesn't really help the person asking the question (especially if they're not in the USA). That site also claims Sydney, Australia isn't a place...
    – Móż
    Commented Jun 2, 2016 at 5:04

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